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Date: Mon, 13 Feb 2017 09:12:25 +0530
From: Archit Taneja <architt@...eaurora.org>
To: Rob Herring <robh@...nel.org>, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel.vetter@...el.com>,
Sean Paul <seanpaul@...omium.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Frank Rowand <frowand.list@...il.com>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Jingoo Han <jingoohan1@...il.com>,
Inki Dae <inki.dae@...sung.com>,
Joonyoung Shim <jy0922.shim@...sung.com>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Javier Martinez Canillas <javier@....samsung.com>,
Stefan Agner <stefan@...er.ch>,
Alison Wang <alison.wang@...escale.com>,
Xinliang Liu <z.liuxinliang@...ilicon.com>,
Rongrong Zou <zourongrong@...il.com>,
Xinwei Kong <kong.kongxinwei@...ilicon.com>,
Chen Feng <puck.chen@...ilicon.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
CK Hu <ck.hu@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Marek Vasut <marex@...x.de>,
Mark Yao <mark.yao@...k-chips.com>,
Heiko Stuebner <heiko@...ech.de>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Chen-Yu Tsai <wens@...e.org>,
Liviu Dudau <liviu.dudau@....com>,
Mali DP Maintainers <malidp@...s.arm.com>,
Neil Armstrong <narmstrong@...libre.com>,
Carlo Caione <carlo@...one.org>,
Kevin Hilman <khilman@...libre.com>,
Rob Clark <robdclark@...il.com>, Jyri Sarha <jsarha@...com>,
Tomi Valkeinen <tomi.valkeinen@...com>,
Eric Anholt <eric@...olt.net>,
Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH v2 4/6] drm: convert drivers to use
of_graph_get_remote_node
On 02/10/2017 12:35 AM, Rob Herring wrote:
> Convert drivers to use the new of_graph_get_remote_node() helper
> instead of parsing the endpoint node and then getting the remote device
> node. Now drivers can just specify the device node and which
> port/endpoint and get back the connected remote device node. The details
> of the graph binding are nicely abstracted into the core OF graph code.
>
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.
For the msm and adv75xx driver:
Tested by: Archit Taneja <architt@...eaurora.org>
>
> Signed-off-by: Rob Herring <robh@...nel.org>
> Acked-by: Neil Armstrong <narmstrong@...libre.com>
> Acked-by: Philipp Zabel <p.zabel@...gutronix.de>
> Tested-by: Liviu Dudau <liviu.dudau@....com>
> Tested-by: Eric Anholt <eric@...olt.net>
> ---
> v2:
> - tilcdc fix (Jyri Sarha)
> - Dropped an incomplete meson change.
>
> drivers/gpu/drm/arm/hdlcd_drv.c | 22 ++------
> drivers/gpu/drm/arm/malidp_drv.c | 28 ++--------
> drivers/gpu/drm/bridge/adv7511/adv7533.c | 12 +----
> drivers/gpu/drm/bridge/dumb-vga-dac.c | 15 ++----
> drivers/gpu/drm/bridge/ti-tfp410.c | 15 ++----
> drivers/gpu/drm/exynos/exynos_drm_dpi.c | 16 +-----
> drivers/gpu/drm/exynos/exynos_drm_dsi.c | 13 ++---
> drivers/gpu/drm/exynos/exynos_drm_mic.c | 27 +---------
> drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 30 +----------
> drivers/gpu/drm/mediatek/mtk_dpi.c | 12 ++---
> drivers/gpu/drm/mediatek/mtk_hdmi.c | 26 ++--------
> drivers/gpu/drm/meson/meson_venc_cvbs.c | 19 ++-----
> drivers/gpu/drm/msm/dsi/dsi_host.c | 3 +-
> drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 28 +---------
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 18 +++----
> drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 12 +----
> drivers/gpu/drm/tilcdc/tilcdc_external.c | 68 +++----------------------
> drivers/gpu/drm/vc4/vc4_dpi.c | 15 ++----
> 18 files changed, 55 insertions(+), 324 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index e5f4f4a6546d..0f70f5fe9970 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -430,29 +430,13 @@ static int compare_dev(struct device *dev, void *data)
>
> static int hdlcd_probe(struct platform_device *pdev)
> {
> - struct device_node *port, *ep;
> + struct device_node *port;
> struct component_match *match = NULL;
>
> - if (!pdev->dev.of_node)
> - return -ENODEV;
> -
> /* there is only one output port inside each device, find it */
> - ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> - if (!ep)
> - return -ENODEV;
> -
> - if (!of_device_is_available(ep)) {
> - of_node_put(ep);
> + port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> + if (!port)
> return -ENODEV;
> - }
> -
> - /* add the remote encoder port as component */
> - port = of_graph_get_remote_port_parent(ep);
> - of_node_put(ep);
> - if (!port || !of_device_is_available(port)) {
> - of_node_put(port);
> - return -EAGAIN;
> - }
>
> drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
> of_node_put(port);
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index 32f746e31379..47b552f1337c 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -262,7 +262,6 @@ static int malidp_bind(struct device *dev)
> {
> struct resource *res;
> struct drm_device *drm;
> - struct device_node *ep;
> struct malidp_drm *malidp;
> struct malidp_hw_device *hwdev;
> struct platform_device *pdev = to_platform_device(dev);
> @@ -360,12 +359,7 @@ static int malidp_bind(struct device *dev)
> goto init_fail;
>
> /* Set the CRTC's port so that the encoder component can find it */
> - ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> - if (!ep) {
> - ret = -EINVAL;
> - goto port_fail;
> - }
> - malidp->crtc.port = of_get_next_parent(ep);
> + malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
>
> ret = component_bind_all(dev, drm);
> if (ret) {
> @@ -420,7 +414,6 @@ static int malidp_bind(struct device *dev)
> bind_fail:
> of_node_put(malidp->crtc.port);
> malidp->crtc.port = NULL;
> -port_fail:
> malidp_fini(drm);
> init_fail:
> drm->dev_private = NULL;
> @@ -478,29 +471,16 @@ static int malidp_compare_dev(struct device *dev, void *data)
>
> static int malidp_platform_probe(struct platform_device *pdev)
> {
> - struct device_node *port, *ep;
> + struct device_node *port;
> struct component_match *match = NULL;
>
> if (!pdev->dev.of_node)
> return -ENODEV;
>
> /* there is only one output port inside each device, find it */
> - ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> - if (!ep)
> - return -ENODEV;
> -
> - if (!of_device_is_available(ep)) {
> - of_node_put(ep);
> + port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> + if (!port)
> return -ENODEV;
> - }
> -
> - /* add the remote encoder port as component */
> - port = of_graph_get_remote_port_parent(ep);
> - of_node_put(ep);
> - if (!port || !of_device_is_available(port)) {
> - of_node_put(port);
> - return -EAGAIN;
> - }
>
> drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
> port);
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> index 8b210373cfa2..ac804f81e2f6 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> @@ -232,7 +232,6 @@ void adv7533_detach_dsi(struct adv7511 *adv)
> int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
> {
> u32 num_lanes;
> - struct device_node *endpoint;
>
> of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
>
> @@ -241,17 +240,10 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
>
> adv->num_dsi_lanes = num_lanes;
>
> - endpoint = of_graph_get_next_endpoint(np, NULL);
> - if (!endpoint)
> + adv->host_node = of_graph_get_remote_node(np, 0, 0);
> + if (!adv->host_node)
> return -ENODEV;
>
> - adv->host_node = of_graph_get_remote_port_parent(endpoint);
> - if (!adv->host_node) {
> - of_node_put(endpoint);
> - return -ENODEV;
> - }
> -
> - of_node_put(endpoint);
> of_node_put(adv->host_node);
>
> adv->use_timing_gen = !of_property_read_bool(np,
> diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> index e5706981c934..47b4c99162ad 100644
> --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
> +++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> @@ -154,21 +154,12 @@ static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {
>
> static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
> {
> - struct device_node *end_node, *phandle, *remote;
> + struct device_node *phandle, *remote;
> struct i2c_adapter *ddc;
>
> - end_node = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
> - if (!end_node) {
> - dev_err(dev, "Missing connector endpoint\n");
> - return ERR_PTR(-ENODEV);
> - }
> -
> - remote = of_graph_get_remote_port_parent(end_node);
> - of_node_put(end_node);
> - if (!remote) {
> - dev_err(dev, "Enable to parse remote node\n");
> + remote = of_graph_get_remote_node(dev->of_node, 1, -1);
> + if (!remote)
> return ERR_PTR(-EINVAL);
> - }
>
> phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
> of_node_put(remote);
> diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
> index b054ea349952..82a6bdbf6ad0 100644
> --- a/drivers/gpu/drm/bridge/ti-tfp410.c
> +++ b/drivers/gpu/drm/bridge/ti-tfp410.c
> @@ -127,18 +127,13 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = {
>
> static int tfp410_get_connector_ddc(struct tfp410 *dvi)
> {
> - struct device_node *ep = NULL, *connector_node = NULL;
> - struct device_node *ddc_phandle = NULL;
> + struct device_node *connector_node, *ddc_phandle;
> int ret = 0;
>
> /* port@1 is the connector node */
> - ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
> - if (!ep)
> - goto fail;
> -
> - connector_node = of_graph_get_remote_port_parent(ep);
> + connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
> if (!connector_node)
> - goto fail;
> + return -ENODEV;
>
> ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
> if (!ddc_phandle)
> @@ -150,10 +145,10 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi)
> else
> ret = -EPROBE_DEFER;
>
> + of_node_put(ddc_phandle);
> +
> fail:
> - of_node_put(ep);
> of_node_put(connector_node);
> - of_node_put(ddc_phandle);
> return ret;
> }
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> index ad6b73c7fc59..eea529cea19a 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> @@ -164,27 +164,13 @@ enum {
> FIMD_PORT_WRB,
> };
>
> -static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
> -{
> - struct device_node *np, *ep;
> -
> - ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
> - if (!ep)
> - return NULL;
> -
> - np = of_graph_get_remote_port_parent(ep);
> - of_node_put(ep);
> -
> - return np;
> -}
> -
> static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
> {
> struct device *dev = ctx->dev;
> struct device_node *dn = dev->of_node;
> struct device_node *np;
>
> - ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
> + ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
>
> np = of_get_child_by_name(dn, "display-timings");
> if (np) {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index e07cb1fe4860..04528f512c91 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -1670,17 +1670,10 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
>
> of_node_put(ep);
>
> - ep = of_graph_get_next_endpoint(node, NULL);
> - if (!ep) {
> - ret = -EINVAL;
> - goto end;
> - }
> + dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_OUT, 0);
> + if (!dsi->bridge_node)
> + return -EINVAL;
>
> - dsi->bridge_node = of_graph_get_remote_port_parent(ep);
> - if (!dsi->bridge_node) {
> - ret = -EINVAL;
> - goto end;
> - }
> end:
> of_node_put(ep);
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> index a0def0be6d65..93ebb12133e1 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> @@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
> writel(reg, mic->reg + MIC_OP);
> }
>
> -static struct device_node *get_remote_node(struct device_node *from, int reg)
> -{
> - struct device_node *endpoint = NULL, *remote_node = NULL;
> -
> - endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
> - if (!endpoint) {
> - DRM_ERROR("mic: Failed to find remote port from %s",
> - from->full_name);
> - goto exit;
> - }
> -
> - remote_node = of_graph_get_remote_port_parent(endpoint);
> - if (!remote_node) {
> - DRM_ERROR("mic: Failed to find remote port parent from %s",
> - from->full_name);
> - goto exit;
> - }
> -
> -exit:
> - of_node_put(endpoint);
> - return remote_node;
> -}
> -
> static int parse_dt(struct exynos_mic *mic)
> {
> int ret = 0, i, j;
> @@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
> * The first node must be for decon and the second one must be for dsi.
> */
> for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
> - remote_node = get_remote_node(mic->dev->of_node, i);
> + remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
> if (!remote_node) {
> ret = -EPIPE;
> goto exit;
> @@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
> break;
> case ENDPOINT_DSI_NODE:
> /* panel node */
> - remote_node = get_remote_node(remote_node, 1);
> + remote_node = of_graph_get_remote_node(remote_node, 1, 0);
> if (!remote_node) {
> ret = -EPIPE;
> goto exit;
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index ebd5f4fe4c23..18d6570e057d 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
> .unbind = kirin_drm_unbind,
> };
>
> -static struct device_node *kirin_get_remote_node(struct device_node *np)
> -{
> - struct device_node *endpoint, *remote;
> -
> - /* get the first endpoint, in our case only one remote node
> - * is connected to display controller.
> - */
> - endpoint = of_graph_get_next_endpoint(np, NULL);
> - if (!endpoint) {
> - DRM_ERROR("no valid endpoint node\n");
> - return ERR_PTR(-ENODEV);
> - }
> -
> - remote = of_graph_get_remote_port_parent(endpoint);
> - of_node_put(endpoint);
> - if (!remote) {
> - DRM_ERROR("no valid remote node\n");
> - return ERR_PTR(-ENODEV);
> - }
> -
> - if (!of_device_is_available(remote)) {
> - DRM_ERROR("not available for remote node\n");
> - return ERR_PTR(-ENODEV);
> - }
> -
> - return remote;
> -}
> -
> static int kirin_drm_platform_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -288,7 +260,7 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - remote = kirin_get_remote_node(np);
> + remote = of_graph_get_remote_node(np, 0, 0);
> if (IS_ERR(remote))
> return PTR_ERR(remote);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 90fb831ef031..dbd554c09a39 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -661,7 +661,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct mtk_dpi *dpi;
> struct resource *mem;
> - struct device_node *ep, *bridge_node = NULL;
> + struct device_node *bridge_node;
> int comp_id;
> int ret;
>
> @@ -706,15 +706,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> - if (ep) {
> - bridge_node = of_graph_get_remote_port_parent(ep);
> - of_node_put(ep);
> - }
> - if (!bridge_node) {
> - dev_err(dev, "Failed to find bridge node\n");
> + bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
> + if (!bridge_node)
> return -ENODEV;
> - }
>
> dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 0e8c4d9af340..f14e472812ce 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1433,7 +1433,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> {
> struct device *dev = &pdev->dev;
> struct device_node *np = dev->of_node;
> - struct device_node *cec_np, *port, *ep, *remote, *i2c_np;
> + struct device_node *cec_np, *remote, *i2c_np;
> struct platform_device *cec_pdev;
> struct regmap *regmap;
> struct resource *mem;
> @@ -1485,29 +1485,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> if (IS_ERR(hdmi->regs))
> return PTR_ERR(hdmi->regs);
>
> - port = of_graph_get_port_by_id(np, 1);
> - if (!port) {
> - dev_err(dev, "Missing output port node\n");
> + remote = of_graph_get_remote_node(np, 1, 0);
> + if (!remote)
> return -EINVAL;
> - }
> -
> - ep = of_get_child_by_name(port, "endpoint");
> - if (!ep) {
> - dev_err(dev, "Missing endpoint node in port %s\n",
> - port->full_name);
> - of_node_put(port);
> - return -EINVAL;
> - }
> - of_node_put(port);
> -
> - remote = of_graph_get_remote_port_parent(ep);
> - if (!remote) {
> - dev_err(dev, "Missing connector/bridge node for endpoint %s\n",
> - ep->full_name);
> - of_node_put(ep);
> - return -EINVAL;
> - }
> - of_node_put(ep);
>
> if (!of_device_is_compatible(remote, "hdmi-connector")) {
> hdmi->bridge.next = of_drm_find_bridge(remote);
> diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> index a2bcc70a03ef..8566de2edb62 100644
> --- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
> +++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> @@ -217,25 +217,14 @@ static const struct drm_encoder_helper_funcs
>
> static bool meson_venc_cvbs_connector_is_available(struct meson_drm *priv)
> {
> - struct device_node *ep, *remote;
> + struct device_node *remote;
>
> - /* CVBS VDAC output is on the first port, first endpoint */
> - ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
> - if (!ep)
> + remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
> + if (!remote)
> return false;
>
> -
> - /* If the endpoint node exists, consider it enabled */
> - remote = of_graph_get_remote_port(ep);
> - if (remote) {
> - of_node_put(ep);
> - return true;
> - }
> -
> - of_node_put(ep);
> of_node_put(remote);
> -
> - return false;
> + return true;
> }
>
> int meson_venc_cvbs_create(struct meson_drm *priv)
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 3819fdefcae2..da8619f9eb2e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1637,9 +1637,8 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
> }
>
> /* Get panel node from the output port's endpoint data */
> - device_node = of_graph_get_remote_port_parent(endpoint);
> + device_node = of_graph_get_remote_node(np, 1, 0);
> if (!device_node) {
> - dev_err(dev, "%s: no valid device\n", __func__);
> ret = -ENODEV;
> goto err;
> }
> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> index b782efd4b95f..9f36fad1915e 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> @@ -225,32 +225,6 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
> return 0;
> }
>
> -static struct device_node *mdp4_detect_lcdc_panel(struct drm_device *dev)
> -{
> - struct device_node *endpoint, *panel_node;
> - struct device_node *np = dev->dev->of_node;
> -
> - /*
> - * LVDS/LCDC is the first port described in the list of ports in the
> - * MDP4 DT node.
> - */
> - endpoint = of_graph_get_endpoint_by_regs(np, 0, -1);
> - if (!endpoint) {
> - DBG("no LVDS remote endpoint\n");
> - return NULL;
> - }
> -
> - panel_node = of_graph_get_remote_port_parent(endpoint);
> - if (!panel_node) {
> - DBG("no valid panel node in LVDS endpoint\n");
> - of_node_put(endpoint);
> - return NULL;
> - }
> -
> - of_node_put(endpoint);
> -
> - return panel_node;
> -}
>
> static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
> int intf_type)
> @@ -270,7 +244,7 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
> * bail out early if there is no panel node (no need to
> * initialize LCDC encoder and LVDS connector)
> */
> - panel_node = mdp4_detect_lcdc_panel(dev);
> + panel_node = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
> if (!panel_node)
> return 0;
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 2390c8577617..5e7ccd04ada6 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -373,19 +373,13 @@ static void rockchip_add_endpoints(struct device *dev,
> struct component_match **match,
> struct device_node *port)
> {
> - struct device_node *ep, *remote;
> + struct device_node *remote;
> + int i;
>
> - for_each_child_of_node(port, ep) {
> - remote = of_graph_get_remote_port_parent(ep);
> - if (!remote || !of_device_is_available(remote)) {
> - of_node_put(remote);
> - continue;
> - } else if (!of_device_is_available(remote->parent)) {
> - dev_warn(dev, "parent device of %s is not available\n",
> - remote->full_name);
> - of_node_put(remote);
> + for (i = 0; i < 3; i++) {
> + remote = of_graph_get_remote_node(port, 0, i);
> + if (!remote)
> continue;
> - }
>
> drm_of_component_match_add(dev, match, compare_of, remote);
> of_node_put(remote);
> @@ -464,7 +458,7 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
> continue;
> }
>
> - rockchip_add_endpoints(dev, &match, port);
> + rockchip_add_endpoints(dev, &match, port->parent);
> of_node_put(port);
> }
>
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> index 6dfdb145f3bb..d67f39e850a8 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> @@ -23,6 +23,7 @@
> #include <linux/workqueue.h>
> #include <linux/completion.h>
> #include <linux/dma-mapping.h>
> +#include <linux/of_graph.h>
>
> #include "tilcdc_drv.h"
> #include "tilcdc_regs.h"
> @@ -1013,16 +1014,7 @@ int tilcdc_crtc_create(struct drm_device *dev)
> drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
>
> if (priv->is_componentized) {
> - struct device_node *ports =
> - of_get_child_by_name(dev->dev->of_node, "ports");
> -
> - if (ports) {
> - crtc->port = of_get_child_by_name(ports, "port");
> - of_node_put(ports);
> - } else {
> - crtc->port =
> - of_get_child_by_name(dev->dev->of_node, "port");
> - }
> + crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
> if (!crtc->port) { /* This should never happen */
> dev_err(dev->dev, "Port node not found in %s\n",
> dev->dev->of_node->full_name);
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
> index c67d7cd7d57e..19cf57a6ec76 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
> @@ -187,39 +187,6 @@ int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
> return ret;
> }
>
> -static int tilcdc_node_has_port(struct device_node *dev_node)
> -{
> - struct device_node *node;
> -
> - node = of_get_child_by_name(dev_node, "ports");
> - if (!node)
> - node = of_get_child_by_name(dev_node, "port");
> - if (!node)
> - return 0;
> - of_node_put(node);
> -
> - return 1;
> -}
> -
> -static
> -struct device_node *tilcdc_get_remote_node(struct device_node *node)
> -{
> - struct device_node *ep;
> - struct device_node *parent;
> -
> - if (!tilcdc_node_has_port(node))
> - return NULL;
> -
> - ep = of_graph_get_next_endpoint(node, NULL);
> - if (!ep)
> - return NULL;
> -
> - parent = of_graph_get_remote_port_parent(ep);
> - of_node_put(ep);
> -
> - return parent;
> -}
> -
> int tilcdc_attach_external_device(struct drm_device *ddev)
> {
> struct tilcdc_drm_private *priv = ddev->dev_private;
> @@ -227,7 +194,7 @@ int tilcdc_attach_external_device(struct drm_device *ddev)
> struct drm_bridge *bridge;
> int ret;
>
> - remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
> + remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
> if (!remote_node)
> return 0;
>
> @@ -266,35 +233,16 @@ int tilcdc_get_external_components(struct device *dev,
> struct component_match **match)
> {
> struct device_node *node;
> - struct device_node *ep = NULL;
> - int count = 0;
> - int ret = 0;
> -
> - if (!tilcdc_node_has_port(dev->of_node))
> - return 0;
>
> - while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
> - node = of_graph_get_remote_port_parent(ep);
> - if (!node || !of_device_is_available(node)) {
> - of_node_put(node);
> - continue;
> - }
> -
> - dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
> -
> - if (of_device_is_compatible(node, "nxp,tda998x")) {
> - if (match)
> - drm_of_component_match_add(dev, match,
> - dev_match_of, node);
> - ret = 1;
> - }
> + node = of_graph_get_remote_node(dev->of_node, 0, 0);
>
> + if (!of_device_is_compatible(node, "nxp,tda998x")) {
> of_node_put(node);
> - if (count++ > 1) {
> - dev_err(dev, "Only one port is supported\n");
> - return -EINVAL;
> - }
> + return 0;
> }
>
> - return ret;
> + if (match)
> + drm_of_component_match_add(dev, match, dev_match_of, node);
> + of_node_put(node);
> + return 1;
> }
> diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
> index 1e1f6b8184d0..ac9655451b25 100644
> --- a/drivers/gpu/drm/vc4/vc4_dpi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dpi.c
> @@ -366,23 +366,14 @@ static const struct of_device_id vc4_dpi_dt_match[] = {
> */
> static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
> {
> - struct device_node *endpoint, *panel_node;
> + struct device_node *panel_node;
> struct device_node *np = dev->of_node;
> struct drm_panel *panel;
>
> - endpoint = of_graph_get_next_endpoint(np, NULL);
> - if (!endpoint) {
> - dev_err(dev, "no endpoint to fetch DPI panel\n");
> - return NULL;
> - }
> -
> /* don't proceed if we have an endpoint but no panel_node tied to it */
> - panel_node = of_graph_get_remote_port_parent(endpoint);
> - of_node_put(endpoint);
> - if (!panel_node) {
> - dev_err(dev, "no valid panel node\n");
> + panel_node = of_graph_get_remote_node(np, 0, 0);
> + if (!panel_node)
> return NULL;
> - }
>
> panel = of_drm_find_panel(panel_node);
> of_node_put(panel_node);
> --
> 2.10.1
>
--
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